Evening was drawing on. The sun was sinking behind the western hills. It was beginning to grow dark among the arches where the great magician had imprisoned himself among dead and withered relics,--fragments broken from the great and living world without. We returned to his observatory. He opened a window and contemplated with dreamy glances the stars which were kindling one after another in the heavens. The twilight is a favorable time for conversation of the kind for which we had been preparing ourselves. We were soon settled in comfortable, roomy arm-chairs and discoursing earnestly,--we, the man of the fifteenth century, and the unborn souls of the nineteenth, whom he had summoned that he might look into the future, and who now used him to look back into the past. He spoke to us of his science.... "My knowledge is not of myself. Far, far away behind these hills, behind the snowy summits of the Alps, behind the mountains of the 'farthest-dwelling Garamantes,' on nameless heights which disappear among the clouds, the temple of truth was built long ago over the fountain from which life flows. That this temple is demolished we well know; only the first human pair has wandered through its sacred halls. But he who desires, who yearns and has patience, can sit down by the margin of the stream of Time and grasp and draw ashore some of the cedar-beams from the ruined temple drifting upon the billows, and from the form of the fragments may determine the structure of the whole. All wisdom has its roots in the past, and the farther we penetrate antiquity, the richer the remains we find of a highest human wisdom. What is Albertus Magnus with his profound knowledge in comparison with the angelic wisdom of Dionysius Areopagita, and what is the latter compared with that of the prophet who denounced his woes over Nineveh and Babylon? And yet these divinely commissioned men would gladly have been taught by the seventy elders who were allowed with Moses to approach the mountain where God chose to reveal himself, there receiving the mystic knowledge of the Cabala. On Sinai, however, God's secret was veiled in clouds, lightnings and terror; Moses himself was permitted to see him only 'from behind'--did not obtain a morning-knowledge (a knowledge _a priori_, an analogy-seeking pupil of Schelling would have called it), but an evening-knowledge (knowledge _a posteriori_, he would have added). The morning-knowledge was shown only to the man of the dawn of time and was extinguished at the first sin. From that time every successive generation has deteriorated from its predecessor: "'_Aetas parentum, pejor avis, tulit Nos nequiores, mox daturos Progeniem vitiosiorem_,'